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The air is now expanded khhrmi i. But it paved the way by inviting the attention of scientists for proper studies and research. The triple point of water is taken as a fundamental fixed point having a temperature The process represents cooling of air in the regenerative heat exchanger.

L5 4W per tonne of refrigeration is required to maintain the temperature of 40 a C in the refrigerator.

Textbook of Refrigeration and Air Conditioning

Values of specific heats for some commonly used substances. The air in the dosed system does not come in contact directly with the space to be cooled. Thus in a reversible cycle, the initial conditions are restored at the end of the cycle.

The cooling water for condensing redrigeration pumped from the cooling water pond or tower. The heat and work represent the energy crossing the boundary of the system. Thus in an open cycle system, a drier should be used, 2. In olden days, air was widely used in commercial applications because of its availability at free of cost.


If the refrigerant used is R, find out the C. The substance which works in a heal pump to extract heal from a cold body and to deliver it to a hot body is called a refrigerant.

Since the return air from the conditioned space is mixed with outside air before entry to the cooling coil in the ratio of 4: Preview — Textbook of Refrigeration and Air-conditioning by R.

Show on the psychrometric chan when two air streams yield fogged state of air.

Textbook of Refrigeration and Air-conditioning by R.S. Khurmi

Also indicate the direction of the external energy How to or from the equipments. The T-s diagram for a simple air cooling system is shown in Fig. It puts off the compressor if the winding temperature exceeds the safe limit, thus protecting the winding against high temperature.

Manoj rated it it was amazing Dec 06, Mechaiiiiai equilibrium, A system is said to be in mechanical equilibrium, when there is no unbalanced forces acting on any part of the system or the system as a whole. It takes the addition of heat or the removal of heat to produce these changes.


Three stage compression with flash intercoolers. P is always greater conditoining unity. Also find the refrigerating efficiency of the plant. The compression and expansion are tsen tropic, and follows the law pv lA – constant.

A simple air cooled system is used for an aeroplane faring a load of 10 tonnes The atmospheric conditionibg and temperature are 0.

Assume compression and expansion processes to be isentropic.

Full text of “A Textbook Of Refrigeration And Air Conditioning By R. S. Khurmi And J. K Gupta”

T t h the intercooling is said to be incomplete or imperfect intenooling. The coefficient of performance of the steam jet refrigeration system varies from a 0.

It is usually denoted by h fg. Mass of air required to take the cabin load We know that mass of air required to take the cabin load.

Textbook of Refrigeration and Air-conditioning (M.E.)

One method of overcoming this drawback of boot strap system is to use www. C The air from the evaporator i.

Find the tonnage of ihe plant which runs for 18 hours per day.